Ultrafiltration membrane It is a consistent aperture specification. The rated aperture range is 0.001–0.02 A micrometer-sized microporous filtration membrane, utilizing ultrafiltration—a membrane filtration process driven by a pressure difference. Ultrafiltration membranes are mostly made from cellulose acetate or high-molecular-weight materials with similar properties, making them ideally suited for separating and concentrating solutes in solutions. Commonly used for separating colloidal suspensions that are difficult to handle with other separation techniques. Its application areas are continually expanding.

　　Membrane filtration driven by a pressure difference can be categorized into three types: ultrafiltration, microfiltration, and reverse osmosis—each distinguished by the smallest particle size or molecular weight that the membrane layer can retain. When using the membrane's rated pore size range as the distinguishing criterion, the microporous membrane (MF) The rated aperture range is 0.02 ~ 10 μm; Ultrafiltration membrane (UF) For 0.001 ~ 0.02 μm; Reverse osmosis membrane (RO) For 0.0001 ~ 0.001 μm Thus, it is clear that ultrafiltration membranes are most suitable for separating and concentrating solutes in solutions, or for handling colloidal suspensions—processes that are often challenging to achieve with other separation techniques. The membrane-making technology for ultrafiltration membranes—specifically, the technique to achieve desired pore sizes with a narrow distribution—is critically important, as numerous factors influence pore control. Depending on factors such as the type and concentration of the solution used during membrane formation, as well as the evaporation and condensation conditions, it’s possible to produce ultrafiltration membranes with varying pore sizes and pore-size distributions. Ultrafiltration membranes are typically polymeric separation membranes, and the primary polymer materials used for this purpose are: Cellulose derivatives, polysulfone, polyacrylonitrile, polyamide, and polycarbonate, among others Ultrafiltration membranes can be manufactured in various forms, such as flat membranes, spiral-wound membranes, tubular membranes, or hollow-fiber membranes. Widely used in industries such as pharmaceuticals, food processing, and environmental engineering.

　　We all know that a sieve is used to sift things—allowing smaller particles to pass through while trapping larger ones. But have you ever heard of a sieve that can actually separate molecules? ? Ultra-film — This super sieve can separate molecular sieves of varying sizes. ! So, what exactly is a ultrafiltration membrane? ?

　　 Ultrafiltration membrane It is a porous membrane with a remarkable "sieve-like" separation function. Its pore size ranges from just a few nanometers to several dozen nanometers. That is to say, only as thin as a single strand of hair. 1‰! Apply appropriate pressure to the side of the membrane... This allows you to filter out solute molecules larger than the pore size, enabling the separation of those with molecular weights greater than 500 Dalton, particle size greater than 2 ~ 20 Nanoparticles. The structure of ultrafiltration membranes can be either symmetric or asymmetric: the former is isotropic, lacking a skin layer, with pores that are uniform in all directions, making it suitable for depth filtration. ; The latter features a denser surface layer and a predominantly finger-like structure in its underlying layer, with the surface layer measuring 0.1 Micrometers or smaller And features orderly arranged micropores, with a bottom layer thickness of 200 ~ 250 Micrometers rely on surface-level filtration. Industrially used ultrafiltration membranes are typically asymmetric. The primary membrane materials for ultrafiltration membranes include cellulose and its derivatives, polycarbonate, polyvinyl chloride, polyvinylidene fluoride, polysulfone, polyacrylonitrile, polyamide, polysulfonamide, sulfonated polysulfone, cross-linked polyvinyl alcohol, and modified acrylic polymers, among others.

　　 Ultrafiltration membrane It is one of the earliest-developed polymer separation membranes, in 60 The ultrafiltration unit has already been industrialized, and ultrafiltration membranes are now widely used in industry—becoming one of the new, essential chemical engineering operations. They are employed for separating, concentrating, and purifying bioproducts, pharmaceuticals, and ingredients used in the food industry. ; Also used in terminal treatment devices for blood processing, wastewater treatment, and ultrapure water preparation. In our country, ultrafiltration membranes have been successfully used for the concentration and purification of traditional Chinese medicines, and these membranes continue to advance alongside technological progress. Its screening capabilities will undoubtedly be improved and strengthened, leading to ever-greater contributions to human society.